Anyone has experience, tips or pointers on converting
and loading large-ish scale legacy data into Wikibase? Is there no
complete solution (envisaged) for this right now?
Even though this topic is a few days old, I would like to add some of my
experiences. I had the same problem about a year ago and wrote a Java
program to insert millions of items pretty fast. It works for the LTS
version. I don't know if it also works with the current version.
You can find the code here:
https://github.com/jze/wikibase-insert
Best wishes,
Jesper